Supply Insensitivity Temperature Sensor for Microprocessor Thermal Monitoring Using Adc-Sar

N.Elakkiya N.Elakkiya
2013 IOSR Journal of Electrical and Electronics Engineering  
In this project, temperature sensing in microprocessors and other digital integrated circuits is essential to prevent thermal overrun and guarantee processor performance. Increased attention to energyefficient computing is pushing power management systems to become dynamic and localized to processor subsystems, to balance power and performance requirements. In this paper we analyze CMOS temperature sensors that work by measuring temperature-dependent delays in CMOS inverters with two new
more » ... s distinguish this work from the prior delay-based temperature sensors. First, our sensor operates with simple, low-cost one-point calibration. Second, it uses delay-locked loops (DLLs) to convert inverter delays to digital temperature outputs: the use of DLLs enables low energy (0.24 J/sample) and high bandwidth ( 5 kilo-samples/s), facilitating fast thermal monitoring. After calibration, measurement errors for 15 chips fabricated in digital CMOS 0.13 m fall -4.0 o C to 4.0 o C within C in a temperature range of 0-100 o C, where the temperature chamber used has a control uncertainty of+1.1 o C or -1.1 o C. ADC-SAR is used for fast thermal monitoring. Simulations show the sensor to have a resolution of approximately +.5ºC with each conversion taking approximately a minimum of 550 μs and a maximum of 1.05ms
doi:10.9790/1676-530107 fatcat:li4ppqym4jgmnb2bq3zem2nora